26 DISSECTION OF THE CAT 



Cut away one side of the nasal cavity. 



8. The Schneiderian Membrane is the mucous 

 membrane which covers the upper turbinated 

 bones. It is somewhat darker in color than the 

 rest of the nasal membrane, and contains the end 

 organs of the olfactory nerves. 



9. The (Esophagus is the posterior continuation 

 of the pharynx. It is a collapsed, fleshy tube 

 which passes to the stomach, as already seen. 



10. The Glottis is the slit-like opening situated 

 on the floor of the pharynx. It is guarded by 

 two fleshy folds, the false vocal cords, and by an 

 anteriorly-placed triangular cartilaginous lobe, the 

 epiglottis. This organ completely covers the 

 opening during the act of swallowing. The glot- 

 tis opens below into the larynx. 



1 1. The Larynx is the cartilaginous box forming 

 the anterior expanded portion of the trachea. 

 (Plate I., c.) It is composed of the following 

 pieces : 



The epiglottis is the triangular cartilaginous 

 flap covering the glottis anteriorly. 



The thyroid cartilage is the largest of all, and 

 forms the anterior border of the larynx. 



The arytenoids are the two small cartilages 

 lying one on either side of the mid-line, on the 

 dorsal side just below the thyroid. 



The cricoid is the ring-shaped cartilage lying 

 below the arytenoids and thyroid. It has the ap- 



